Answer:
The slip of a timber wall is computed using the slip modulus. For a 4mm nail, the slip amounts to 793.981 N/mm per shear plane for common C24 timber. Now, all you need to do is to consider the mean value of the stiffness and the partial safety factor, which is omitted in this example. The distance between the nails used then gives the necessary longitudinal stiffness of the joint.
